122781142 has 32 divisors (see below), whose sum is σ = 212502528. Its totient is φ = 52680000.

The previous prime is 122781137. The next prime is 122781151. The reversal of 122781142 is 241187221.

It is a self number, because there is not a number n which added to its sum of digits gives 122781142.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25767 + ... + 30157.

It is an arithmetic number, because the mean of its divisors is an integer number (6640704).

Almost surely, 2^122781142 is an apocalyptic number.

122781142 is a deficient number, since it is larger than the sum of its proper divisors (89721386).

122781142 is a wasteful number, since it uses less digits than its factorization.

122781142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4476.

The product of its digits is 1792, while the sum is 28.

The square root of 122781142 is about 11080.6652327376. The cubic root of 122781142 is about 497.0238427917.

It can be divided in two parts, 1227 and 81142, that added together give a square (82369 = 287²).

The spelling of 122781142 in words is "one hundred twenty-two million, seven hundred eighty-one thousand, one hundred forty-two".